<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src='./lib/jquery-3.1.0.min.js'></script>
</head>
<body>
       <button>发送ajax</button>
</body>
</html>
<script>
      $("button").click(()=>{
          //alert("aaa");
          $.ajax({
             type:"get",
             url:"/show",
             dataType:"json",
             success:(data)=>{
                console.log(data);
             }
          })
      })
</script>